Question

решите уравнение 5х+х+4х=7

Answer 1

5х+х+4х=7
10х=7
х=7:10
х=0,7

Answer 2

1.5х(х+4)-х(7-0.5х)=0.5(10-2х)=

=1.5х+6х-7х+0.5х=5-х

=1.5х+6х-7х+0.5х+х=5

х=5